There are 1 questions in this calculation: for each question, the 1 derivative of y is calculated.
    Note that variables are case sensitive.
\[ \begin{equation}\begin{split}[1/1]Find\ the\ first\ derivative\ of\ function\ sqrt(2)y\ with\ respect\ to\ y：\\\end{split}\end{equation} \]\[ \begin{equation}\begin{split}\\Solution:&\\ &Primitive\ function\ = ysqrt(2)\\&\color{blue}{The\ first\ derivative\ function：}\\&\frac{d\left( ysqrt(2)\right)}{dy}\\=&sqrt(2) + y*0*\frac{1}{2}*2^{\frac{1}{2}}\\=&sqrt(2)\\ \end{split}\end{equation} \]

Your problem has not been solved here? Please take a look at the  hot problems ！